SymptomsMy Outlook for Mac calendar synching to the iPhone was working fine, but now it does not synchronize any more.
CauseApple stopped supporting their Sync Services for the MobileMe calendar. This broke the calendar syncing solution that worked for some users (Entourage, Outlook for Mac 2011).
ResolutionUnfortunately, for users of Entourage or Outlook for Mac 2011 there is no way to get syncing working again, without changing their email client.
Parallels suggests switching to using Microsoft Outlook for Windows and the new MobileMe control panel for Windows to such users.
That can be done with the help of Parallels Desktop for Mac that allows to seamlessly run Windows applications on Mac OS.
If you go with the above option:
1. You will be using Microsoft Outlook for Windows - the "gold standard" for an Microsoft Exchange client;
2. You will be able to use other Windows-based solutions on your Mac.